Calculating Stability Envelope

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by Keicha Kempsey49 views·Updated Jun 22, 2020
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  1. Welcome to this short video on how to calculate the
  2. stability envelope of a single case.
  3. Research designed graph within a phase of a single case
  4. research design graph can be cumbersome and confusing their data
  5. within a phase or stable or variable that stability envelope
  6. work beauty utilizing in 80 20% ratio.
  7. For this example, we're going to be taking a look
  8. at a graph of data taken using partial interval measurement
  9. in order to find the mean of the data points
  10. we need to ask.
  11. The values of all data points together.
  12. So the first step is adding those data points that
  13. that appoints are 54 50 61 50 and 60.
  14. To find the mean, we add together almost out of
  15. one which equals 275 and then divide that number by
  16. five. Because you are five data points which will give
  17. us the mean value of 55 again.
  18. You're using some of data points divided by the number
  19. of data points to give you the me, populate the
  20. stability and book.
  21. First we need to multiply the mean, which in this
  22. case is 55 by 20%.
  23. So 20% of 55.
  24. He's one of them.
  25. I mean, so that we can determine which data points
  26. for within that window otherwise known as the stability envelope.
  27. We start by identifying the values that 10% greater and
  28. 10% blessed on the meat.
  29. Right, Because that gives us the tool of 20 per
  30. such kind of dividing the 20% and 1/2 to we're
  31. going to go home above and below the mean by
  32. 10%. That gives us the 20% window.
  33. So since the mean is 11% in this example on,
  34. we're gonna split that in half.
  35. So half of 11 is 5.5.
  36. That means that we're going to be adding 5.5 to
  37. the mean and subtracting 5.5 from the mean to give
  38. us that window so that in this example, the top,
  39. the bottom of the envelope is going to be 49.5
  40. in the top of the envelope is going to be
  41. 60.5, right?
  42. If we draw the lines around that range of values
  43. to give us that image of kind of a little
  44. envelope, we can clearly see that the points um, we
  45. can clearly see the point there within that range of
  46. 49.5 and 60.5.
  47. So in this data set, we can identify four out
  48. of the five points, or 80% of the total points
  49. for within the stability envelope.
  50. Who's this?
  51. Needs 80% criteria.
  52. This data is considered stable.